CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) - 9 months ended Sep. 30, 2018 - USD ($) $ in Thousands	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balances at Dec. 31, 2017	$ 110,445	$ 74,983	$ (2,073)	$ 183,355
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	14,529	0	14,529
Other comprehensive income (loss)	0	0	(5,067)	(5,067)
Cash dividends paid ($0.42 per share)	0	(5,611)	0	(5,611)
Cash in lieu of fractional share for 5 for 4 stock split	0	(13)	0	(13)
Stock options exercised	168	0	0	168
Stock based compensation expense	217	0	0	217
Balances at Sep. 30, 2018	$ 110,830	$ 83,888	$ (7,140)	$ 187,578